Yarn storing device

ABSTRACT

RETARDING RING FOR A YARN STORAGE DEVICE. AN IMPROVED RETARDING RING IS PROVIDED FOR A PRESENTLY KNOWN YARN STORAGE DEVICE WHEREIN YARN FROM A SOURCE IS MOVED TANGENTIALLY ONTO A STORAGE DRUM AND IS THEN DRAWN AXIALLY FROM THE DRUM. MEANS ARE PROVIDED ON THE DISCHARGE PORTION OF SAID DRUM FOR RETARDING THE WITHDRAWAL OF SAID YARN AND THEREBY PROVIDING TENSION THEREON. THE PRESENT INVENTION CONSISTS IN AN IMPROVEMENT IN SUCH RETARDING RING WHEREIN A RING SURROUNDS AND IS SPACED FROM THE DRUM AND IS PROVIDED WITH FINGERS PROJECTING FROM THE RING AND INCLINED BOTH TOWARD THE DRUM AND CIRCUMFERENTIALLY. IN THE PRESENT INVENTION SAID FINGERS IN ONE EMBODIMENT ARE CURVED IN SUCH A MANNER THAT WHEN THE RING IS WITHDRAWN FROM THE DRUM THE FINGERS PROJECT INTO AN IMAGINARY CYLINDER CONCENTRIC WITH THE RING OF A DIAMETER EQUAL TO THE DIAMETER OF THE DRUM. IN ANOTHER EMBODIMENT SAID FINGERS SIMILARLY PROJECT INTO SUCH AN IMAGINARY CYLINDER BUT THEN ARE REVERSELY CURVED SO THAT THEIR TIPS ARE OUTSIDE OF AND SPACED FROM SUCH CYLINDER. IN BOTH EMBODIMENTS THIS PROVIDES AN INCREASED ZONE BY WHICH SUCH FINGERS CONTACT THE YARN BEING WITHDRAWN AND THEREBY APPLY A MORE UNIFORM TENSION THERETO THAN WAS PREVIOUSLY POSSIBLY.

'Nov. 7, 1972 K. I. J. ROSEN 3,702,175

YARN STORING DEVICE Filed Jan. 13, 1971 2 Sheets-Sheet l INVENTQR ma A5346 M062 @OJE/V Nov. 7, 1972 I, J, ROSEN 3,702,176

YARN. STORING DEVICE Filed Jan. 13, 1971 2 Sheets-Sheet 2 Fug. 3 e

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INVENZOR [451 L946 Mil P0507 United States Patent 3,702,176 YARN STORING DEVICE Karl Isac Joel Rosen, Villa Haga, S-52300 Ulricliehamn, Sweden Filed Jan. 13, 1971, Ser. No. 106,044 Int. Cl. B65h 51/20 US. Cl. 242-47.01 4 Claims ABSTRACT OF THE DISCLOSURE Retarding ring for a yarn storage device. An improved retarding ring is provided for a presently known yarn storage device wherein yarn from a source is moved tangentially onto a storage drum and is then drawn axially from the drum. Means are provided on the discharge portion of said drum for retarding the withdrawal of said yarn and thereby providing tension thereon. The present invention consists in an improvement in such retarding ring wherein a ring surrounds and is spaced from the drum and is provided with fingers projecting from the ring and inclined both toward the drum and circumferentially. In the present invention said fingers in one embodiment are curved in such a manner that when the ring is withdrawn from the drum the fingers project into an imaginary cylinder concentric with the ring of a diameter equal to the diameter of the drum. In another embodiment said fingers similarly project into such an imaginary cylinder but then are reversely curved so that their tips are outside of and spaced from such cylinder. In both embodiments this provides an increased zone by which such fingers contact the yarn being withdrawn and thereby apply a more uniform tension thereto than was previously possible.

In my previous application Serial No. 884, I have shown a yarn storing device, wherein the yarn running off a bobbin can be moved tangentially onto a storage drum and can be pulled axially off the drum downwardly through a retarding ring surrounding the drum and having means thereon for resiliently applying a drag to the yarn. In such device, the retarding ring consists of a base ringspaced from and surrounding the drum periphery and of a number of resilient fingers which incline inwardly from the base ring along an imaginary conical surface and also extend in the direction of the relative rotation of the yarn during its withdrawal from the storage drum, and overlap one another in a peripheral direction.

In the storing device according to the said application, the inner ends of the fingers lies, when the retarding ring is removed from the storage drum, on a circle, the radius of which is smaller than the radius of the storage drum. When the retarding ring is connected to the drums, the finger ends abut the drum surface under a light tension so that the yarn cannot be pulled 01f without touching a finger at some point between the finger ends and the drum surface.

The purpose of the present invention is to further develop the storing device according to said application in such a manner as to further improve the retarding eifect and to render same more uniform.

This purpose is attained according to the invention by curving the fingers centrally of the ring in such a manner that, when the retarding ring is removed from the storage drum, a portion of each of said fingers, commencing at a point spaced from the base ring, extends within an imaginary cylinder which has the same radius as the storage drum.

With this construction, when the retarding ring is placed on the storage drum, each finger resiliently abuts 3,702,176 Patented Nov. 7, 1972 ice same not only with its free end but with a portion lying alongside a portion of the storage drum. In this manner the pulled-off yarn automatically contacts progressively more fingers and the retarding effect can thereby be adjusted more exactly and can be maintained more constant than previously.

In an advantageous further development of the invention, the fingers are arc-shaped so that when the retarding ring is removed from the storage drum, a central section of each finger extends within the cylinder corresponding to the storage drum and the free end of each finger is outside of said cylinder at a distance therefrom. Thus, the fingers of this form of the retarding ring are concaved outwardly and contact the storage drum only in a central zone. Hence the yarn during its removel contacts the fingers only in this central zone. It slidingly contacts the free points, depending on the pulling-off direction, either not at all or only at the inside surface thereof. This avoids an unfavorable influence on the retarding effect which is caused by so-called beards on the free ends of the fingers, which beards are often diificult to avoid in the case of a plastic-molded retarding ring. Thus, the curvature in the fingers permits the use of this presently known desirable method of manufacture without incurring the undesired side effects.

Exemplary embodiments of the invention are illustrated in the drawings, in which:

FIG. 1 is a schematized side-elevational view of a yarn supply according to the invention;

FIG. 2 is a top view of the retarding ring of the yarn supply according to FIG. 1;

FIG. 3 is a side view of a detail of the retarding ring according to FIG. 2; and

FIG. 4 is a detail according to FIG. 3 of a difierent embodiment.

In FIG. 1, a bobbin 2 is arranged on a support arm 1 which is secured, in any conventional manner (not illustrated) to the frame of the textile machine to which yarn is to be fed. A yarn 3 is tangentially fed over a series of yarn guiding members 4, 5, 6 and 7 to a storage drum 8. The storage drum 8 is supported rotatably in the support arm 1 and is driven for rotation by a motor (not illustrated). By rotating the drum 8, a yarn supply 3a is formed thereon which yarn supply can have one or multiple layers. This yarn supply is moved downwardly in axial direction of the drum by means which are already known and hence not illustrated. For example a conical extension on the drum can be used for this purpose, in the vicinity of which conical extension the yarn 3 can be fed. A spring-loaded spider which extends through longitudinal slots of the drum can also be used to effect the axial yarn movement. The quantity of the yarn supply 3a is maintained within predetermined limits by measuring the yarn supply, for example in a photo-electrical manner or by scanning the path of the mentioned spider, and the drive of the drum is turned ofl when the upper yarn supply limit is reached and is turned on when the lower limit is reached. The yarn is pulled off axially from the storage drum 8 through a yarn eye 9, said latter being in alignment with the storage drum 8, in form of a running-off strand 3b and is fed to the point of use, as the knitting zone, of the respective textile machine.

In order for the tension of the pulled-off yarn 3b to be as small but as constant as possible, there is provided a retarding ring 10 which surrounds the periphery of the storage drum 8. This retarding ring consists, in the illustrated exemplary embodiment, of a single piece of plastic and has a base ring 11 and fingers 12 originating at said base ring. The base ring surrounds the periphery of the storage drum 8 and is spaced therefrom by the distance a. The free ends of the resilient fingers 12 rest on a 3 shoulder 13 which is tapered in direction of the yarnrunoif in the illustrated manner and is connected to the lower edge of the storage drum 8.

The construction of the retarding ring can be taken from FIGS. 2 to 4. The fingers 12 project upwardly along an imaginary conical surface and when assembled, project in direction of the yarn-runoif from the base ring 11, same being inclined in the direction of the relative rotation U of the yarn with reference to the drum 8. The angle of inclination to the tangent on the periphery of the base ring 11 is approximately between 10 and 20. As can be clearly recognized from FIG. 2, the fingers 12 are dimensioned and arranged in such a manner that they substantially overlap one another in a peripheral direction. Their length is approximately 1 to 2 cm. Their thickness lies in the magnitude of 0.5 to 1 mm., depending on the material used. The fingers are set sufficiently closely to each other that about one finger appears along the periphery of the base ring 11 approximately for each centimeter of peripheral length.

FIGS. 3 and 4 illustrate schematically, in an enlarged scale, how the fingers are curved, so that they elastically abut the storage drum when the retarding ring is applied. FIG. 3 illustrates a finger 12 with a curvature toward the inside of the ring, through which, when the retarding ring is withdrawn, a large portion of the length of the finger including its free end lies within an imaginary cylinder with a diameter D which equals the diameter of the storage drum. This imaginary cylinder wall which corresponds to the wall of the storage drum is indicated in FIGS. 3 and 4 by a dash-dotted line, In the embodiment according to FIG. 3, it can be easily recognized that, after the retarding ring is applied to the storage drum, each finger 12 resiliently abuts the wall of the storage drum with a large portion of its length adjacent the free end.

In the embodiment according to FIG. 4, the finger 12' has an arched curvature through which only the central section of its length lies within the imaginary cylinder and the free end projects outwardly. The finger 12' will, after the retarding ring is placed on the storage drum, resiliently abut said storage drum with only its central section while the free end projects away from the storage drum.

During the running-off of the yarn portion 3b, the yarn slides in both illustrated embodiments along several resilient fingers 12 or 12' through which a uniform retarding effect is obtained. Thus, in the case of the embodiment according to FIG. 4, it does not contact the free ends of the fingers 12'.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. In a thread storage and delivery device having a storage drum onto which a thread is wound tangentially, and a retarding ring mounted and surrounding said drum for controlling the axial pull-off of thread from the drum, said retarding ring comprising a base ring surrounding and spaced from the periphery of the storage drum, and a plurality of individual resilient fingers fixedly connected to said base ring around the periphery thereof, said individual fingers being spaced from one another and projecting inwardly from the base ring along an imaginary conical surface, said fingers being inclined in the peripheral direction of the base ring in the direction of relative rotation of the yarn during its withdrawal from the storage drum with the adjacent fingers overlapping one another in said peripheral direction, said base ring and said plurality of resilient fingers being constructed in one piece of a plastic material, said storage drum having an annular shoulder formed thereon, and said plurality of resilient fingers having the free ends thereof supported on said shoulder, the improvement wherein the fingers are curved inwardly of the ring in such a manner that, when the retarding ring is removed from the storage drum, a portion of each of said fingers, commencing at a point spaced from the base ring, extends within an imaginary cylinder which has the same radius as the storage drum.

2. A device according to claim 1, wherein the radially inner edges of the free ends of the resilient fingers, when the resilient fingers are in a relaxed condition, lie on a circle having a diameter less than the diameter of the storage drum periphery.

3. A device according to claim 1, wherein the adjacent fingers are spaced approximately one centimeter apart around the periphery of the base ring.

4. A device according to claim 1, wherein the fingers are arc-shaped so that, when the retarding ring is removed from the storage drum, a central section of each finger extends within the cylinder corresponding to the storage drum and the free end of each finger is outside of said cylinder and spaced therefrom.

References Cited UNITED STATES PATENTS 3,411,548 11/1968 Pfarrwaller 2A247.12 X 3,419,225 12/1968 Rosen 242-47.l2 3,549,299 12/ 1970 Rosen 24247.12 2,889,034 '6/1959 Hawtin et al. 24247.12

STANLEY N. GILREATH, Primary Examiner M. S. GERSTEIN, Assistant Examiner US. Cl. X.R. 24247. 12 

